/*******************************************************************************
 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 ******************************************************************************/

/*******************************************************************************
  Include
*******************************************************************************/
#include "fs.h"
#include "fsdata.h"
#include <string.h>

/*******************************************************************************
  Definitions
*******************************************************************************/

/* Set this to 1 to include "fsdata_custom.c" instead of "fsdata.c" for the   */
/* file system (to prevent changing the file included in CVS)                 */
#ifndef HTTPD_USE_CUSTOM_FSDATA
#define HTTPD_USE_CUSTOM_FSDATA 0
#endif

#if HTTPD_USE_CUSTOM_FSDATA
#include "fsdata_custom.c"
#else
#endif // HTTPD_USE_CUSTOM_FSDATA
#include "fsdata.c"

/*******************************************************************************
  Prototypes
*******************************************************************************/

#if LWIP_HTTPD_CUSTOM_FILES
int fs_open_custom(struct fs_file *file, const char *name);
void fs_close_custom(struct fs_file *file);
#if LWIP_HTTPD_FS_ASYNC_READ
u8_t fs_canread_custom(struct fs_file *file);
u8_t fs_wait_read_custom(struct fs_file *file, fs_wait_cb callback_fn,
                         void *callback_arg);
#endif // LWIP_HTTPD_FS_ASYNC_READ
#endif // LWIP_HTTPD_CUSTOM_FILES

/*******************************************************************************
  Code
*******************************************************************************/
err_t fs_open (struct fs_file *file, const char *name)
{
    const struct fsdata_file *f;

    if ((file == NULL) || (name == NULL)) {
        return ERR_ARG;
    }

    for (f = FS_ROOT; f != NULL; f = f->next) {
        if (!strcmp(name, (char *)f->name)) {
            file->data = (const char *)f->data;
            file->len = f->len;
            file->index = f->len;
            file->pextension = NULL;
            file->http_header_included = f->http_header_included;
            return ERR_OK;
        }
    }
    /* file not found */
    return ERR_VAL;
}

void fs_close (struct fs_file *file)
{
#if LWIP_HTTPD_CUSTOM_FILES
    if (file->is_custom_file) {
        fs_close_custom(file);
    }
#endif /* LWIP_HTTPD_CUSTOM_FILES */
#if LWIP_HTTPD_FILE_STATE
    fs_state_free(file, file->state);
#endif /* #if LWIP_HTTPD_FILE_STATE */
    LWIP_UNUSED_ARG(file);
}

#if LWIP_HTTPD_DYNAMIC_FILE_READ
#if LWIP_HTTPD_FS_ASYNC_READ
int fs_read_async (struct fs_file *file, char *buffer, int count,
                   fs_wait_cb callback_fn, void *callback_arg)
#else  /* LWIP_HTTPD_FS_ASYNC_READ */
int fs_read (struct fs_file *file, char *buffer, int count)
#endif /* LWIP_HTTPD_FS_ASYNC_READ */
{
    int read;

    if (file->index == file->len) {
        return FS_READ_EOF;
    }
#if LWIP_HTTPD_FS_ASYNC_READ
#if LWIP_HTTPD_CUSTOM_FILES
    if (!fs_canread_custom(file)) {
        if (fs_wait_read_custom(file, callback_fn, callback_arg)) {
            return FS_READ_DELAYED;
        }
    }
#else  /* LWIP_HTTPD_CUSTOM_FILES */
    LWIP_UNUSED_ARG(callback_fn);
    LWIP_UNUSED_ARG(callback_arg);
#endif /* LWIP_HTTPD_CUSTOM_FILES */
#endif /* LWIP_HTTPD_FS_ASYNC_READ */

    read = file->len - file->index;
    if (read > count) {
        read = count;
    }

    MEMCPY(buffer, (file->data + file->index), read);
    file->index += read;

    return (read);
}
#endif /* LWIP_HTTPD_DYNAMIC_FILE_READ */

#if LWIP_HTTPD_FS_ASYNC_READ
int fs_is_file_ready (struct fs_file *file, fs_wait_cb callback_fn, void *callback_arg)
{
    if (file != NULL) {
#if LWIP_HTTPD_FS_ASYNC_READ
#if LWIP_HTTPD_CUSTOM_FILES
        if (!fs_canread_custom(file)) {
            if (fs_wait_read_custom(file, callback_fn, callback_arg)) {
                return 0;
            }
        }
#else  /* LWIP_HTTPD_CUSTOM_FILES */
        LWIP_UNUSED_ARG(callback_fn);
        LWIP_UNUSED_ARG(callback_arg);
#endif /* LWIP_HTTPD_CUSTOM_FILES */
#endif /* LWIP_HTTPD_FS_ASYNC_READ */
    }
    return 1;
}
#endif /* LWIP_HTTPD_FS_ASYNC_READ */

int fs_bytes_left (struct fs_file *file)
{
    return file->len - file->index;
}
